当时若不是去登高望远，后来怎知东海的浩瀚。

The psychologist must avoid all teleological interpretations.

The challenge is to make the invisible visible.

The coal industry must evolve or risk becoming obsolete. Adaptation is the key to survival.

挑战在于使不可见的东西变得可见。

无限小在自然中的作用是无限大的。